My Exam 3

# My Exam 3 - View Attempt 1 of 1 Title Exam 3 Started August...

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View Attempt 1 of 1 Title: Exam 3 Started: August 5, 2011 2:36 PM Submitted: August 5, 2011 3:52 PM Time spent: 01:15:23 Total score: 18/20 = 90% Total score adjusted by 0.0 Maximum possible score: 20 1. Calculate the pH of a solution prepared by adding 20.0 mL of 0.100 M HCl to 80.0 mL of a buffer that is comprised of 0.25 M C 2 H 5 NH 2 and 0.25 M C 2 H 5 NH 3 Cl. K b of C 2 H 5 NH 2 = 9.5 x 10 -4 . Student Response Value Correct Answer A. 2.94 B. 10.89 100% C. 10.98 D. 3.11 E. 11.06 Score: 1/1 2. Which of the following solutions would be described as a buffer solution? Student Response Value Correct Answer A. 0.25 M HCl and 0.10 M NaOH B. 0.25 M CH 3 COOH and 0.2 M NaOH 100% C. 0.15 M NaBr and 0.20 M HBr D. 0.25 M CH 3 COOH and 0.2 M HCl E. 0.25 M NH 3 and 0.15 M NaOH Score: 1/1 3. In the titration of a weak monoprotic acid with a solution of sodium hydroxide of known concentration, what quantities are equal at the equivalence point?

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Student Response Value Correct Answer A. The concentrations of hydroxide and hydronium ions B. The number of moles of hydroxide ion added and the number of moles of hydronium ion initially present C. The volume of sodium hydroxide solution added and the volume of acid solution initially present D. The concentration of hydroxide ion added and the concentration of monoprotic acid initially present E. The number of moles of hydroxide ion added and the number of moles of monoprotic acid initially present 100% Score: 1/1 4. Hydroxylamine (HONH 2 ) has a K b = 1.1 x 10 -8 . If 200.0 mL of a 0.5000 M aqueous hydroxylamine solution is mixed with 50.0 mL of 1.000 M aqueous hydrochloric acid, the resulting solution will have a pH
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My Exam 3 - View Attempt 1 of 1 Title Exam 3 Started August...

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